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. 2017 Nov 22;7(4):e34. doi: 10.2106/JBJS.ST.17.00017

Fig. 12.

Fig. 12

The yellow line indicates the area of retroacetabular bone to be separated with an inside-out osteotomy. It combines the retroacetabular cut with the first incomplete ischial cut (dotted lines). The distance of the bone to be cut is rather short, and the diameter at this level is rather small. A change in the sound of the hammer blows indicates lateral perforation by the osteotome. GT = greater trochanter.